Promaster 4537 37mm Variable ND Filter

The range from ND3 to ND400 covers everything I need without swapping filters, and the ring turns smoothly enough to dial in exact exposure mid-shot. I've used it on a bright beach and indoors by a window, both times the footage stayed clean with no color cast. It's become a permanent part of my kit

The range from ND3 to ND400 means I can shoot video in harsh midday sun without ever swapping lenses. It twists smoothly enough that I don't have to worry about jarring the shot, though it did take a few tries to nail the exposure dialing in.

I was a bit skeptical about a variable ND filter at this price point, but the smooth transition from ND3 to ND400 works perfectly for outdoor video work. The build feels solid and doesn't introduce any color cast that I've noticed. Only knock is the 37mm thread is a bit tight to spin at first.